EP1516283B9 - Actuation indicator for a dispensing device - Google Patents

Actuation indicator for a dispensing device Download PDF

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Publication number
EP1516283B9
EP1516283B9 EP03740282A EP03740282A EP1516283B9 EP 1516283 B9 EP1516283 B9 EP 1516283B9 EP 03740282 A EP03740282 A EP 03740282A EP 03740282 A EP03740282 A EP 03740282A EP 1516283 B9 EP1516283 B9 EP 1516283B9
Authority
EP
European Patent Office
Prior art keywords
wheel
indicator
pawl
aerosol canister
actuation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03740282A
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German (de)
English (en)
French (fr)
Other versions
EP1516283B1 (en
EP1516283A1 (en
Inventor
Stanley George GlaxoSmithKline BONNEY
Peter John GlaxoSmithKline BRAND
James William GlaxoSmithKline GODFREY
Paul Kenneth GlaxoSmithKline RAND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Glaxo Group Ltd
Original Assignee
Glaxo Group Ltd
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Filing date
Publication date
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Priority claimed from GB0214360A external-priority patent/GB0214360D0/en
Priority claimed from GB0311191A external-priority patent/GB0311191D0/en
Priority to DK09153472.7T priority Critical patent/DK2058754T3/da
Application filed by Glaxo Group Ltd filed Critical Glaxo Group Ltd
Priority to EP09153472.7A priority patent/EP2058754B1/en
Publication of EP1516283A1 publication Critical patent/EP1516283A1/en
Publication of EP1516283B1 publication Critical patent/EP1516283B1/en
Priority to CY20091100449T priority patent/CY1108995T1/el
Publication of EP1516283B9 publication Critical patent/EP1516283B9/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/02—Housing
    • G06M1/028—Arbors, drum fixing and adjusting means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00—Inhalators
    • A61M15/0065—Inhalators with dosage or measuring devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00—Inhalators
    • A61M15/0065—Inhalators with dosage or measuring devices
    • A61M15/0068—Indicating or counting the number of dispensed doses or of remaining doses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00—Inhalators
    • A61M15/0065—Inhalators with dosage or measuring devices
    • A61M15/0068—Indicating or counting the number of dispensed doses or of remaining doses
    • A61M15/007—Mechanical counters
    • A61M15/0071—Mechanical counters having a display or indicator
    • A61M15/0076—Mechanical counters having a display or indicator on a drum
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/04—Design features of general application for driving the stage of lowest order
    • G06M1/041—Design features of general application for driving the stage of lowest order for drum-type indicating means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00—Inhalators
    • A61M15/009—Inhalators using medicine packages with incorporated spraying means, e.g. aerosol cans

Definitions

  • the present invention relates to an actuation indicator for a dispensing device, e.g. a fluid dispensing device or pressurised fluid dispensing device, such as a pressurised metered dose inhaler (hereinafter referred to as a "pMDI”), and components of such an actuation indicator.
  • a dispensing device e.g. a fluid dispensing device or pressurised fluid dispensing device, such as a pressurised metered dose inhaler (hereinafter referred to as a "pMDI"
  • pMDI pressurised metered dose inhaler
  • pMDIs are well known in the art of inhalation devices. It is therefore not necessary to describe the construction and operation of a pMDI other than in bare essentials.
  • a pMDI comprises an aerosol canister and a tubular actuator.
  • the aerosol canister comprises a pressurised can, typically made from a metal, such as aluminium. Inside the can there is contained the pressurised medicinal aerosol formulation.
  • the can is sealingly capped by a metering valve assembly at what will hereinafter be referred to as the "outlet end" of the aerosol canister.
  • the valve assembly includes a hollow dispensing member or valve stem which projects from the outlet end of the aerosol canister. The dispensing member is mounted for sliding movement relative to the aerosol canister between an extended position, to which the dispensing member is biased by a biasing mechanism in the valve assembly, and a depressed position.
  • Movement of the dispensing member from the extended position to the depressed position results in a metered dose of the aerosol formulation being dispensed from the canister through the dispensing member.
  • the tubular actuator comprises an internal passageway having an open end.
  • the aerosol canister is slidable into the internal passageway through the open end with the outlet end being inserted first into the internal passageway.
  • the actuator has a stand or stem block which receives the dispensing member of the aerosol canister when the aerosol canister is received in the actuator in a "rest position".
  • the stand has a passageway with an inlet end for receiving the dispensing member and an outlet end which faces a mouthpiece of the actuator.
  • the stand holds the dispensing member stationary in the actuator whereby depression of the aerosol canister from its rest position farther into the actuator to an "actuated position" causes the dispensing member to be displaced from the extended position to the depressed position relative to the canister.
  • a metered dose of the aerosol formulation will thereby be dispensed out of the mouthpiece of the actuator via the internal passageway of the stand.
  • a patient in need of a metered dose of the medicinal aerosol formulation places their lips on the mouthpiece of the actuator and then concurrently inhales and depresses the aerosol canister from the rest position to the actuated position.
  • the inspiratory airflow produced by the patient entrains the medicinal component of the aerosol into the patient's respiratory tract.
  • a mouthpiece instead of a mouthpiece, there could be provided a nozzle for nasal use.
  • actuation indicators for instance dose counters which are either incremented on each actuation of the pMDI to display a running total of the number of doses dispensed from the pMDI or decremented on each actuation to display the number of doses left in the dispenser. See, for example, WO96/16686 , US-A-4817822 and US5482030 .
  • a recently developed dose counter is described in PCT Patent Application No. WO98/56444 to Glaxo Group Limited.
  • the dose counter is fixably secured on the outlet end of the aerosol canister and includes a display which denotes the number of metered doses of the medicament formulation left in the aerosol canister.
  • the display of the dose counter is visible to the patient through a window provided in the actuator.
  • the display is presented by a plurality of indicator wheels rotatably mounted on a common axle, each wheel having numerals from '0' to '9' displayed in series around the circumference.
  • the display wheels are arranged so that the display shows the claimed total number of doses available in the aerosol canister, the so-called "label claim".
  • an indexing mechanism in the dose counter comprising a star wheel, a driver yoke and a rack operates to decrement the number displayed by the display by rotation of one or more of the indicator wheels.
  • the rack which is formed in the actuator, protrude into the dose counter.
  • the rack engages the yoke of the indexing mechanism to cause it to operate to decrement the number displayed by the display by turning the star wheel.
  • the index mechanism of the mechanical dose counter known from WO98/56444 includes a lost motion coupling to compensate for overtravel of the dose counter relative to the rack as the aerosol canister reciprocates between the rest position and the actuated position in the actuator.
  • a device and method for attaching a dose counter to an aerosol canister is disclosed in PCT application publication WO01/28887 , also to Glaxo Group Limited.
  • the dose counter is fixedly secured to the outlet end of the aerosol canister through a split-ring collar. More particularly, a skirt portion of the dose counter housing surrounds a neck on the can of the aerosol canister, and the aplit-ring collar is wedged in-between the skirt and a reentrant surface of the neck and then ultrasonically welded to the skirt. This effectively provides a permanent convection between the dose counter and the aerosol canister to prevent the dose counter from being tampered with.
  • actuator and/or dose counter that is inexpensive to manufacture due to the lack of the need for tight manufacturing tolerances. It would also be desirable to provide an actuator and/or dose counter that is simple and therefore inexpensive to assemble. It would also be desirable to provide an actuator and/or dose counter that can be used with more than one size of aerosol canister. It would also be desirable to provide components of such devices that allow for wide manufacturing tolerances.
  • the present invention provides an actuation indicator comprising a drums sub-assembly comprising a rotatable actuation indicator wheel, a rocking, ratchet pawl for rotating the indicator wheel in a set direction and a rocking mechanism for the pawl driven by a slipping clutch arrangement, wherein the slipping clutch arrangement comprises a slipping clutch spring engaged at one end to a pinion of a rack and pinion assembly and at a second end to the ratchet pawl.
  • the slipping clutch spring has a generally U-shaped configuration.
  • the open end of the spring engages a boss of the pinion and the closed end of the spring defines a track for slidingly engaging a boss provided on the pawl.
  • the ratchet pawl engages a ratchet wheel that is fixed to the indicator wheel.
  • a resilient, non-return leg engages a tooth of the ratchet wheel to prevent rotation of the ratchet wheel in a direction other than the set direction and the non-return leg rides up and over the teeth to allow rotation in the set direction.
  • At least two indicator wheels arranged to sequentially count down from a set figure to zero, there being at least a tens wheel and a units wheel, wherein the indicator wheels lock from further rotation in the set direction when they have counted down to zero, the slipping clutch spring then slipping upon further attempts to rotate the mechanism.
  • the actuation indicator wheel(s) and/or pinion may be mounted on an axle which is provided by a spring that is adapted in use to bias the wheel(s) and/or pinion towards another element of the actuation indicator with which the wheel(s) and/or pinion is engaged.
  • This biasing allows the two engaging elements to be made with wide tolerances while still being able to operate correctly together.
  • the other element with which the pinion engages is the rack.
  • the indicator wheel(s) is for indicating actuation of a device with which the indicator is associated, e.g. for indicating at least a part of a count of the number of doses of a substance left in, or dispensed from, a dispensing device.
  • the axle Preferably there are at least two indicator wheels on the axle, for instance three indicator wheels as in the exemplary embodiment hereinafter to be described.
  • the wheels may respectively be a units wheel and a tens wheel, and hundreds wheel where there is a third wheel, for indicating a dose count.
  • the other, element is a rotatable element mounted on a second, preferably parallel, axle. More preferably, the second axle is also provided by the spring.
  • the spring also comprises a biasing sections which connects the axles and biases the axles towards one another.
  • the section may (i) be U-shaped, (ii) have substantially parallel sides and (iii) be substantially perpendicular to the two axles.
  • the actuator indicator may comprise a casing adapted to be attached over a valve stem end of a canister to form a canister unit.
  • the casing may comprise a sleeve part having a generally cylindrically shaped section having a generally cylindrical inner surface extending from a top of the sleeve part towards a base wall, and a collar affixable around a neck of the canister, and sized, when around the neck of the canister, to fit through the top of the sleeve part, into the sleeve pan, whereat it will contact at leat a portion of the generally cylindrical inner surface, wherein the generally cylindrical inner surface has a shoulder for supporting the collar to prevent the collar from being inserted further into the sleeve part, the shoulder being spaced from the top and the base wall of the sleeve part.
  • the canister unit may be a pressurised canister unit, such as an aerosol canister unit, e.g. for use in a pressurised metered dose inhaler.
  • the top of the sleeve part comprises a chamfered surface to assist with the insertion of the collar into the sleeve part.
  • the shoulder is formed by an annular step in the generally cylindrical inner surface.
  • the shoulder is formed by a ledge attached to the generally cylindrical inner surface.
  • the collar is a split ring collar.
  • the collar in an assembled canister unit, is welded to the sleeve part.
  • the actuation indicator may be a dose counter for the canister unit having a counter assembly comprising the drums sub-assembly and casing may comprise a sleeve part for receiving the canister and a cap part for receiving the counter assembly wherein the cap part and counter assembly can be assembled together separate from the sleeve part and canister, the sleeve part and cap part then being joinable together to form the casing.
  • the sleeve part is adapted to receive more than one form or type of valve stem end, e.g. pressurised fluid canisters fitted with different valves.
  • the sleeve part comprises a top through which, in use, a valve stem end of the canister will be inserted and a base wall spaced from the top having more than one support thereon, each support being for supporting a different form of valve stem end, whereby more than one different valve stem end can be supported in the sleeve part.
  • the supports are annular ledges.
  • the ledges are concentric.
  • a first said support is of a first height above the base wall and a second said support is of a lesser height above the base wall.
  • the present invention further provides a dispensing device, e.g. for dispensing a fluid, on which is mounted an actuation indicator according to the invention.
  • the actuation indicator will be adapted to be operated upon each actuation of the dispensing device to indicate said actuation of the device.
  • the actuation indicator will benin the form of a dose counter which displays a numerical count of the number or doses of the context of the device left to be dispense, or the number of doses dispensed. On actuation of the device, the numerical count is either incremented or decremented, depending on whether the count is of doses left or of doses dispensed.
  • the dispensing device has a dispensing or outlet end and the actuation indicator is mounted on this end.
  • the dispensing device is an aerosol canister having a can and a valve assembly at the outlet end. They valve assembly may be a metering valve assembly, as for example where for use in a pressurised metered dose inhaler.
  • FIGURE 1 shows a pressurised metered dose inhaler, or pMDI, 1.
  • the pMDI 1 comprises a tubular actuator 3 of a generally L-shape.
  • the actuator 3 is provided with an open-ended through passage or internal passageway 5 which extends from an upper opening or open end 7 to a lower opening (not shown) in a mouthpiece 9.
  • the actuator further comprises a viewing window 11.
  • the pMDI 1 further comprises an aerosol canister unit 15, which comprises an aerosol canister 17, shown in ghost and having a standard construction as described in the 'Background of the Invention' section above, and a dose counter module 19 mounted on the outlet end of the canister 17.
  • the aerosol canister 17 contains a pressurised medicinal aerosol formulation, for example a therapeutic agent suspended or dissolved in a liquefied gas propellant, typically a hydrofluoroalkane (HFA) propellant, such as HFA-134a or HFA-227.
  • HFA hydrofluoroalkane
  • the aerosol canister unit 15 is adapted to be slid into the passageway 5 of the actuator 3 through the upper opening 7 when the aerosol canister unit 15 is inverted, i.e. with the dose counter module 19 at the leading end, so that it is inserted first into the actuator 3.
  • the aerosol canister unit 15 is slid along the passageway 5 to a rest position in which a dispensing member (not shown) of the aerosol canister 17, which project into the dose counter module 19, engages a stand (not shown) in the passageway 5 so that the dispensing member is held stationary in the actuator 3. Further depression of the aerosol canister unit 15 into the passageway 5 causes the dispensing member to be depressed into the aerosol canister 17 and a metered dose of the medicinal aerosol formulation will then be dispensed from the aerosol canister 17. The dose will thereby be exhausted from the actuator 3 through the mouthpiece 9.
  • the passageway 5 defines a longitudinal inner track portion 21 to receive a complementary protrusion 23 on the outer circumferential surface of the dose counter module 19.
  • the protrusion coincides with a display window 25 of the dose counter module.
  • the window 11 of the actuator 3 is located in the wall of the longitudinal track portion 21 to ensure that the display window 25 on the protrusion 23 registers with the window 11 of the actuator 3. A patient can thereby view the display in the dose counter window 25 when the aerosol canister unit 15 is mounted in the actuator 3.
  • the dose counter module 19 has a hollow outer casing 30 made from a plastics material, for example polypropylene (PP) .
  • the outer casing 30 is formed from a cap part 31 and a sleeve part 33.
  • the cap part 31 has a plurality of posts 35 which project upwardly (in inverted orientation) from the periphery of the cap part 31. They are provided to extend through alignment holes (not shown) in the sleeve part 33.
  • the posts 35 are subsequently joined or adhered to an inner surface of the sleeve part 33, for example by welding, such as ultrasonic welding. This ensures a permanent connection of the cap part 31 to the sleeve part 33.
  • the cap and sleeve parts 31,33 both comprise elements of the protrusion 23 of the dose counter module 19.
  • the window 25 is retained in a track 39 formed in those elements of the protrusion 23 when the cap and sleeve parts 31, 33 are mated together.
  • the window may be made of a transparent plastics material, for instance polymethyl methacrylate (PMMA) , such as PERSPEX (RTM).
  • the cap part 31 has a generally U-shape cross section.
  • the dispensing member (not shown) of the aerosol canister 17 is received in the concave cut-out 41 of the U-shaped cap part 31.
  • the stand is received in the cut-out 41 for engagement with the dispensing member.
  • the cap part 31 of the dose counter module 19 is arranged about the stand. See WO98/56444 , and in particular FIGURE 1 thereof, for a fuller disclosure of the dispensing member and the stand therefor.
  • the dose counter module 19 when the dose counter module 19 is assembled, it is mounted to the outlet end of the aerosol canister 17 through a split-ring collar 43, for example made of PP, which is mounted to the neck on the can of the aerosol canister 17 and then wedged between the neck and an inner circumferential surface 45 of the sleeve part 33 of the outer casing 30 prior to welding it thereto by ultrasonic welding, as further detailed in WO-A-0128887 , supra .
  • a split-ring collar 43 for example made of PP
  • the outer casing 30 of the dose counter module 19 houses a mechanical dose counting mechanism, details of which now follow.
  • the cap part 31 of the outer casing 30 retains a drums sub-assembly 50 of the counting mechanism.
  • the drums sub-assembly 50 comprises an axle spring 51 having an upper axle 53, a lower axle 55, which extends parallel to the upper axle 53, and a U-shaped connector section 57 oriented perpendicularly to the upper and lower axles 53, 55 .
  • the axle spring 51 is made from a metal, such as a stainless spring steel.
  • the convector section 57 operated to bias the upper and lower axles 53,55 to a closed position, i.e. towards one another.
  • the drums sub-assembly 50 further comprises a set of three indicator wheels 59,61,63 which are adapted to be co-axially mounted on the upper axle 53 for rotation thereon.
  • the indicator wheels 59,61,63 are formed from a plastics material, e.g. acetal, ideally by injection moulding.
  • Each indicator wheel 59,61,63 is provided with a central aperture 60,62,64 to enable them to be slid onto the upper axle 53 of the axle spring 51.
  • Each indicator wheel 59,61,63 has numbers arranged circumferentially in order on the rims 65, 67, 69 of the wheels 59,61,63, applied for example in the manner disclosed in International patent application publication WO-A-0108733 , also to Glaxo Group Limited.
  • each indicator wheel 59, 61, 63 on the upper axle 53 determines which number on its rim 65, 67, 69, is displayed through the window 25 of the dose counter module 19.
  • the indicator wheels 59, 61, 63 collectively display a three digit number in the window 25, which number identifiers the number of metered doses of the medicinal aerosol formulation left in the aerosol canister 17.
  • the indicator wheels 59,61,63 are arranged on the upper axle 53 so that the three digit number displayed in the window 25 corresponds to the label claim of metered doses available in the aerosol canister 17.
  • the use of three indicator wheels 59, 61, 63 enables the dose counter module 19 to be used with an aerosol canister which is filled with over one hundred metered doses of a medicinal aerosol formulation.
  • the number of indicator wheels could be increased or decreased depending on the number of metered doses in the aerosol canister 17. For instance, if the "label claim" was less than a hundred metered doses, it may be convenient to use only two indicator wheels. Of course, three indicator wheels could still be used.
  • the units and tens wheels 59,61 each have the numbers '0' to '9' inclusive equi-angularly arranged thereon in series, while the hundreds wheel 63 only has the numbers '0' to '2' inclusive arranged thereon in series, although with the same inter-number angular spacing (36°) as for the numbers on the units and tens wheels 59, 61. of course, the aeries of numbers on the hundreds wheel 63 can be increased or decreased, depending on the "start count" desired.
  • the units wheel 59 has a ratchet wheels 71 on its right-hand side which is provided with teeth 74 on its circumference 73.
  • the ratchet wheels 71 is supported on the end of a shaft 72, (see FIGURES 7 and 14B ).
  • the left-hand side of the units wheel 59 is provided with a boss 75 provided with just two teeth (a "bunny" tooth 77).
  • the tens wheel 61 and the hundreds wheel 63 each have a boss 79,81 on the right-hand side with a toothed circumference 83,65.
  • FIGURE 7 shows that the toothed circumferences 83,85 have teeth 87,89 whose tips are flush with the rims 67,69 of the associated indicator wheel 61,63.
  • the tens wheel 61 is further provided with a boss 91 on its left-hand side which is also provided with a bunny tooth 93 on its outer circumference 95.
  • the hundreds wheel 63 has a boss 97, having an outer circumference 99 provided with a radially protruding segment 101 which lies flush with the rim 69 of the hundreds wheel 63.
  • the drums sub-assembly 50 further comprises a set of two knock gears 103,105 having axial apertures 107,109 which enable the knock gears 103,105 to be co-axially mounted on the lower axle 55 of the axle spring 51 for rotation thereon.
  • each knock gear 103, 105 has a toothed wheel portion 111,113, a disc portion 115,117 arranged parallel to the associated toothed wheeled portion 111,113, but axially offset therefrom, and an axially-arranged hollow shaft portion 119,121 which connects the associated toothed wheel and disc portions 111,113:115,117.
  • the knock gears are made of a plastics material, e.g. acetal, and are ideally made, by infection moulding.
  • the disc portions 115,117 of the knock gears 103,105 function to locate the knock gears and indicator wheels correctly in the cap part 31.
  • the disc portions 115,117 inhibit axial play of the indicator wheels and knock gears on the axle spring 51 by overlapping the outer surfaces of the units and hundreds wheels 59, 63, on the one hand, and being overlapped by surface features in the cap part 31 (not shown), on the other hand. So, neither the indicator wheels 59,61,63 nor the knock gears 103,105 can be outwardly axially displaced on the spring axle 51 once located in the outer casing 30.
  • the toothed wheeled portions 111,113 of the knock gears 103,105 are divided intro two axial sections, a right-hand side section 123, 125 and a left-hand side section 127, 129.
  • the number of teeth presented by the right-hand side sections 123, 125 (4 teeth) is less than the number of teeth presented by the left-hand side sections 127,129.
  • the inherent biasing force in the axle spring 51 ensures that the indicator wheel 59,61,63 and knock gears 103,105 are biased towards one another so that the interengagable circumferential surfaces thereof interengage one another.
  • the upper and lower axles 53, 55 need to be parted against the action of the biasing force to accommodate the indicator wheels 59, 61, 63 and knock gears 103, 105.
  • the upper and lower axles 53, 55 are spaced apart by a distance which is greater than their spacing in the rest or return state of the axle spring 51. Accordingly, the upper and lower axles 53,55 push the indicator wheels 59,61,63 and knock gears 103,105, respectively, towards one another. A good connection between the indicator wheels 59,61,63 and knock gears 103,105 therefore results.
  • the drive wheel sub-assembly 150 comprises a drive wheel 151 having a, pinion 153 having an outer circumference 155 defined by a series of teeth 157.
  • the drive wheel 151 further comprises a boss 159 extending axially from the left-hand aide of the pinion 153 (as viewed in e.g. FIGURE 2 ).
  • An axial passage or passageway 161 extends through the pinion 153 and the boss 159.
  • the drive wheel 151 is a plastics component of the dose counter module 19, e.g. of acetal, for instance made by injection moulding.
  • the drive wheel sub-assembly 150 further comprises a drive wheel support spring 163 made from a metal, such as stainless steel.
  • the drive wheel support spring 163 defines an axle section 165 which is insertable into the axial passageway 161 of the drive wheels 151 for rotatable support of the drive wheel 151.
  • the drive wheel sub-assembly 150 yet further comprises a slipping clutch spring 167, preferably formed from a metal, such as stainless spring steel.
  • the clutch spring 167 is of a generally U-shaped configuration having a pair of generally parallel arm sections 169,171 connected by a U-bend connector section 173.
  • the connector section 173 biases the arm sections 169,171 to be closed together thereby enabling the arm sections 169,171 to be clamped onto the boss 159 of the drive wheel 151, as shown in FIGURE 9 , for example.
  • one of the arm sections 169 of the clutch spring 167 is formed with a curved portion 175 adjacent its free end which is of complementary size and shape to the outer circumferential surface 177 of the boss 159.
  • FIGURE 2 shows that the dose counting mechanism further comprises a rotatable plastics pawl 200 (e.g. acetal) having a pawl arm 201 with a pawl tooth 203 at its tip, a C-shaped hub 205 shaped to be rotatably mounted on the shaft 72 of the units wheel 59, and a boss 207 extending axially from the right-hand side of the rotatable pawl 200 which is adapted to be slidingly received in the track 174 defined between the arm sections 169,171 of the clutch spring 167.
  • the pawl may be infection moulded.
  • FIGURE 7 The assembled state of the counting mechanism is shown in FIGURE 7 , and its arrangement in the cap part 31 of the outer casing 30 of the dose counter module 19 is shown in FIGURES 4-6 .
  • the operation of the counting mechanism to show the number of metered doses of the medicinal aerosol formulation left will now be described.
  • the mechanism of the dose counter module 19 is in the state shown in FIGURES 8, 9 and 10A-B .
  • a rack 13 projecting upwardly from a base surface of the actuator 3 extends through an aperture 20 in the cap part 31 of the outer casing 30 of the dose counter module 19 so that a set of teeth 14 on the rack 13 mesh with the teeth 157 of the pinion 153 or the drive wheel, 151.
  • the drive wheel support spring 163 biases the drive wheel 151 towards the window 25.
  • the interaction of the rack 13 with the opinion 153 causes the drive wheel 151 to be displaced against the biasing force of the drive wheel support spring 163. This results in the pinion teeth 157 being biased against the rack teeth 14 thereby ensuring a good engagement therebetween.
  • the rotatable pawl 200 In the rest position of the aerosol canister unit 15 in the actuator 3, the rotatable pawl 200 has an angular orientation relative to the ratchet wheels 71 which results in the pawl tooth 203 engaging behind one of the hatchet teeth 74.
  • the indicator wheels 59,61,63 are arranged on the upper axle 53 of the axle spring 51 so that the numerical indicia thereon are lined up to show in the window 25 of the actuator 3 the starting number of metered doses available in the aerosol canister 17 for dispensing.
  • This starting number corresponds to the number of metered doses stated on the label of the aerosol canister 17, e.g. the "label claims".
  • the starting number of metered doses may be '160', as indicated in FIGURE 15A .
  • the label claim need not, however, match the actual number of available doses since an aerosol canister will usually be overfilled slightly to allow for losses during storage, for example. This also provides a reserve of doses for a user once the counter has reached zero in case of emergencies.
  • FIGURES 11A-B shows the counting mechanism at rest.
  • the downstroke causes the dose counter module 19 to move downwardly in the direction of arrow A relative to the rack 13 of the actuator 3.
  • This relative movement causes the teeth 14 of the rack 13 to rotate the drive wheel 151 in the direction of arrow B through its interaction with the pinion 153.
  • the rotation of the drive wheel 151 causes the clutch spring 167 mounted on the boss 159 to rotate therewith.
  • This in turn causes the rotatable pawl 200 to rotate on the shaft 72 of the units wheel 59 in the direction of arrow C, which direction is opposite to the direction of rotation B of the drive wheel 151.
  • FIGURE 12A shows that the rotation of the pinion 153 of the drive wheel 151 is able to be translated into counter-rotation of then pawl 200 on the units wheel 59 through the ability of the boss 207 of the pawl 200 to slide in the guide track 174 defined in the clutch spring 167.
  • the engagement of the rack 13 with the pinion 153 causes the drive wheel 151 to rotate in an opposite direction (arrow E).
  • the toggle-link coupling between the drive wheel 151 and pawl 200 causes the pawl 200 to rotate in an opposite direction (arrow F) .
  • the rotation of the pawl 200 in the direction of arrow F causes the pawl arm 201 to pull the units wheel 59 in the same direction through the engagement of the paws tooth>2.03 with the trailing flank surface of the ratchet tooth 74 which it dropped over on the downstroke of the aerosol canister unit 15 in the actuator 3.
  • the fixed pawl 18 is resiliently formed so that it is able to be flexed out of the way by one of the ratchet teeth 74 and then drop behind that tooth 74 to prevent counter-rotation of the units wheel 59 at the end of the return stroke of the aerosol canister unit 15 in the actuator 3.
  • the pawl 200 abuts with another end stop 66, this time presented by the cap part 31 of the outer casing 30. This prevents the pawl 200 causing more than one ratchet tooth 74 to pasts the fixed pawl 18 on the return stroke of the aerosol canister unit 15. If at this stage the return stroke of the aerosol canister unit is incomplete, i.e, the rest position has not been reached, the drive wheel 151 is free to continue rotating relative to the slipping clutch spring 167 in the direction of arrow E (through the engagement of the rack 13 with the pinion 1533).
  • the units wheel 59 upon each actuation cycle of the aerosol canister unit 15, the units wheel 59 is caused to be rotatably indexed by an angular amount sufficient to cause the previous units figure displayed in the window 25 to be advanced and replaced by the next unit figure in the series, which is one less than the previous figure.
  • the numerical indicia on the units wheel 59 are equi-angularly spaced about the circumference thereof, the units wheel 59 is relatively indexed by 36° upon each actuation cycle of the aerosol canister unit 15. It will thus be appreciated that the number of ratchet teeth 74 on the ratchet wheel 71 corresponds to the number of numerical indicia on the units wheel 59, i.e. 10. It will further be appreciated that after each complete revolution of the units wheel 59 the same unit a figure is displayed in the window 25.
  • the bunny tooth 77 of the units wheel 59 will engage the left-hand side section 127 of the toothed wheel portion 111 of the right-hand knock gear 103 at the same point in each revolution of the units wheel 59 on the upper axle 53.
  • the bunny tooth 77 is arranged on the units wheel 59 so that its engagement with the left-hand side section 127 of the toothed wheel portion 111 of the right-hand knock gear 103 coincides with the number '0' being displayed by the units wheel 59 in the window 25.
  • the next actuation cycle of the aerosol canister unit 15 causes the bunny tooth 77 to transmit a rotational force to the right-hand knock gear 103, through its engagement with the left-hand side section 127 of its toothed wheel portion 111.
  • the rotation imparted to the right-hand knock gear 103 by the bunny tooth 77 of the units wheel 59 is transmitted to the tens wheel 61 through the meshing of the left-hand side section 127 of the toothed wheel portion 111 with the teeth 87 of the tens wheel 61.
  • the net result of this is that the numerical indicia displaced by the units wheel 59 and tens wheel 61 are concurrently decremented by one.
  • the result is to decrement the number displayed in the window 25 from '160' to '159'. This is also illustrated in FIGURES 14A-F .
  • the right-hand side section 123 of the toothed wheel portion 111 of the right-hand knock gear 103 is received in a recess 78 ( FIGURES 15A ) formed in the rim 65 of the units wheel 59 which is co-extensive with the gap between the ears of the bunny tooth 77.
  • the bunny tooth 93 on: the tens wheel 61 is advanced towards engagement with the left-hand knock gear 105, specifically the left-hand side section 129 of the toothed wheel portion 113 thereof.
  • the bunny tooth 93 is disposed adjacent a tooth of the left-hand side section 129 of the toothed wheel portion 113 of the left-hand knock gear 105.
  • the result of the next actuation cycle of the aerosol canister unit 15 is to cause the rotation or motion imparted to the tens wheel 59, by the co-operation of the units wheel 59 and the right-hand knock gear 103, to be transmitted to the hundreds wheel 63 in likewise manner.
  • the counting mechanism further comprises a "lockout" arrangement which locks the drums sub-assembly 50 from being driven when each indicator wheel 59, 61, 63 is angularly positioned on the upper axle 53 of the axle spring 51 so that the display reads '000'.
  • the lockout arrangement is such as not to prevent the aerosol canister unit 15 still being able to be actuated to dispense doses of medicinal aerosol formulation still remaining in the aerosol canister 17.
  • medicinal aerosol canisters are overfilled (compared to the label claim) for safety, issues. For example, for rescue medicaments, such as branchodilators, it is imperative that the patient still be able to use the aerosol canister unit 15 after the label claim of metered doses has been used.
  • the hundreds wheel 63 carries a peg 98 which, when the hundreds wheel 63 is angularly oriented so as to display a '0' in the window 25, abuts with a stop 42 provided in the cap part 31 of the outer casing 30 of the dose counter module 19. This abutment of the peg 98 with the stop 42 prevents further rotation of the hundreds wheel 63 by the pawl-and-ratchet drive mechanism. Moreover, the left-hand knock gear 105 is also locked from further rotation due to its interengagement with the locked hundreds wheel 63.
  • the tens wheel 61 is able to complete one further revolution on the upper axle 53 before it too becomes locked from further rotation through engagement of the bunny tooth 93 with the left-hand knock gear 105.
  • the locking of the tens wheel 61 further results in the right-hand knock gear 103 being locked from further rotation due to its tooth engagement with the tens wheel 61.
  • the tens wheel 61 becomes locked out when it too displays a '0' ion the window 25.
  • the units wheel 59 is able to complete just one more revolution for it to display a '0' in the window 25.
  • the units wheel 59 then in turn becomes locked out by the interengagement of its bunny tooth 77 with the right-hand knock gear 103. See FIGURES 16A-F .
  • This sleeve part 33 is adapted to be attached to a cap part 31 (see FIGURE 5 ) to form a casing for a dose counter module 19. It has four holes 131, 133, 134 for receiving posts 35 on the cap part 31. Two of the holes 131, 132 are cylindrical for receiving cylindrical posts 35. The other two holes are generally cylindrical but with as flattened part (i.e. generally D shaped) for receiving correspondingly shaped posts 35 on the cap part 31.
  • the two non-cylindrical holes 133 , 134 are relatively rotated so that the cap part 31 can only be fitted in one orientation even if the posts 35 are symmetrically arranged.
  • FIGURE 4 only one post 35 is non-cylindrical
  • FIGURE 3 the posts 35 have a square section, with hook clips 37 on the ends thereof).
  • Two posts 135 are also provided on the sleeve part 33 extending from the bottom 137 thereof. These posts 135 engage into holes 136 provided in the cap part 31 (see FIGURE 5 ). The posts 135 on the sleeve part 33 are shorter than the posts 35 on the cap part 31.
  • the sleeve part 33 is generally cylindrical. However, in the bottom 137, there is moulded a base moulding having a generally u-shaped configuration to match the U-shaped configuration of the cap part 31 defined by the concave cut-out 41 (see, e.g., FIGURE 4 ).
  • This U-shaped base moulding further defines the position for the canister's valve stem 27 (see FIGURES 22 and 23 ) and the stand or stem block 13 (described above with reference to the prior art) to fit into. Further it defines part of the protrusion 23 described above (the protrusion 23 receives the window 25).
  • the base moulding extends from the bottom 137 of the sleeve part 33 up to a base wall 139.
  • the outlet end of the canister 17 may, in use, rest against an upper aide of this base wall 139 (or on supports provided thereon), as will be described with reference to FIGURES 22 and 23 bellow.
  • the moulding on its lower side, however, provides, in combination witch the cap part 31, a cavity into which the indexing or counting mechanism, such as the drums sub-assembly 50, can be fitted. See FIGURES 22, and 23 .
  • FIGURE 22 shows a canister 17 which is fitted with a first type of valve assembly. 250.
  • FIGURE 23 shows the canister 17 fitted with a second, different type of valve assembly 300 (i.e, the can is the same, but the valve assembly differs) .
  • the valves 250, 300 have valve stem ends 29 (or ferrules) of different shape.
  • the first valve assembly 250 there is a small nose 49 adjacent the valve stem 27.
  • the nose 49 of the second valve assembly 300 is much lounger, axially.
  • valve assemblies 250, 300 protrude from the associated cans by a different distance D1,D2, i.e. then valve assemblies 250,300 have a different thickness. So, the valve stems 27 are spaced outboard from the can at different distances D1, D2.
  • each valve stem 27 it is important that the tip of each valve stem 27 be positioned at a common, or substantially common, position relative to a reference surface of the dose counter module 19, e.g. the base wall 139.
  • the spatial position of the tip of each valve stem 27 in the dose: counter module 19, when assembled to the respective aerosol canister 17, must be the same, or substantially the same.
  • the valve stems 27 must be spaced at the same, or substantially same, distance from the reference surface of the dose counter module 19.
  • the upper side of the base wall 139 has two differently sized concentric supports or ledges 141, 142.
  • the first ledge 141 comprises an annulus (see FIGURE 20 ) extending upwards from the base wall 139. It has an appropriate height to support, in use, the first valve assembly 250, as shown by arrow 143 in FIGURE 22 .
  • the second ledge 142 comprises a smaller annulus extending upwards from the base wall 139. It is concentric with the first ledge 141. However, it extends upwards to a lesser extent. It is adapted to support, in use, the second valve assembly 300, as marked by arrow 144 in FIGURE 23 .
  • the base wall 139 also comprises an aperture 145 in its centre, concentric with the two annuluses.
  • the aperture 145 allows the valve stem 27 of the canister 17 to extend through the base wall 139 so that it can be inserted into the attend or stem block 333.
  • the ledges 141,142 respectively support the first and second, valve assemblies 250, 300 in the sleeve part 33 such that the valve stems 27 extend through the aperture 45 by the same distance, or substantially the same distance.
  • the rest positions in the actuator 3 of the aerosol canister units 15 incorporating the different valve assemblies 250, 300 is the same, or substantially the same. This is because the spatial position of the valve stem tips in the respective dose counter module 19 is the same.
  • the sleeve part 33 also comprises a split ring collar 43 , as previously described, for assisting in the connection of the sleeve part 33 to the canister 17 via the neck 47, which is angular.
  • the wall 147 of the cylindrical portion 140 of the sleeve part 33 has an internal wall surface having a step or shoulder 146 for resting the collar 43 on.
  • FIGURE 3 shows this as a separately made ledge that is attached to the internal wall surface.
  • the shoulder 146 assists in locating the collar 43 correctly for adhering or welding it to the sleeve part 33 for securing the canister 17 in the sleeve part 33 with the correct depth of insertion.
  • the top 138 of the wall 147 is chamfered also to assist in the insertion of the collar 43 and canister 17 into the sleeve part 33.
  • the mouthpiece 9 may be replaced with a nozzle for insertion into a patient's nostril, i.e. for intra-nasal use.
  • the therapeutic agent contained in the aerosol canister 17 may for the treatment of mild, moderate or severe acute or chronic symptoms or for prophylactic treatment.
  • the therapeutic agent is preferably for treating respirators diseases, e.g. asthma, chronic obstructive pulmonary disease (COPD), although may be for other, therapeutic indications, e.g. treating rhinitis.
  • respirators diseases e.g. asthma, chronic obstructive pulmonary disease (COPD)
  • COPD chronic obstructive pulmonary disease
  • Appropriate therapeutic agents or medicaments may thus be selected from, for example, analgesics, e.g. , codeine, dihydromorphine, ergotamine, fetitanyl or morphine; anginal preparations, e. g. , diltiazem; antiallergics, e.g. , cromoglycate (e.g. as the sodium salt), ketotifen or nedocromil (e.g.
  • analgesics e.g. , codeine, dihydromorphine, ergotamine, fetitanyl or morphine
  • anginal preparations e. g. , diltiazem
  • antiallergics e.g. cromoglycate (e.g. as the sodium salt), ketotifen or nedocromil (e.g.
  • antiinfectives e.g., cephalosporins, penicillins, streptomycin, sulphonamides, tetracyclines and pentamidine
  • antihistamines e.g., methapyrilene
  • anti- inflammatories e.g., beclomethasone (e.g. as the dipropionate ester), fluticasone (e.g. as the propionate ester), flunisolide, budesonide, rofleponide, mometasone (e.g. as the furoate ester), ciclesonide, triamcinolone (e.g.
  • fenoterol e.g. as hydrobromide
  • formoterol e.g. as fumarate
  • isoprenaline metaproterenol
  • phenylephrine phenylpropanolamine
  • pirbuterol e.g. as acetate
  • reproterol e.g. as hydrochloride
  • rimiterol terbutaline
  • bromide as bromide
  • tiotropium as bromide
  • atropine or oxitropium hormones, e.g., cortisone, hydrocortisone or prednisolone
  • xanthines e.g., aminophylline, choline theophyllinate, lysine theophyllinate or theophylline
  • therapeutic proteins and peptides e.g., insulin or glucagons.
  • the medicaments may be used in the form of salts, (e.g., as alkali metal or amine salts or as acid addition salts) or as eaters (e.g., lower alkyl esters) or as solvates (e.g., hydrates) to optimist the activity and/or stability of the medicament and/or to minimise the solubility of the medicament in the propellant.
  • salts e.g., as alkali metal or amine salts or as acid addition salts
  • eaters e.g., lower alkyl esters
  • solvates e.g., hydrates
  • the medicament is an anti-inflammatory compound for the treatment of inflammatory disorders or diseases such as asthma and rhinitis.
  • the medicament is formulated in a hydrofluoroalkane propellant, such as HFA-134a or HFA-227 or a combination thereof.
  • a hydrofluoroalkane propellant such as HFA-134a or HFA-227 or a combination thereof.
  • the medicament is an anti-inflammatory steroid, such as a corticosteroid, for instance fluticasone, e.g. as the propionate ester, or a long acting beta agonist (LABA), such as salmeterol, e.g. as the xinafoate salt, or a combination thereof.
  • a corticosteroid for instance fluticasone, e.g. as the propionate ester, or a long acting beta agonist (LABA), such as salmeterol, e.g. as the xinafoate salt, or a combination thereof.
  • FDA long acting beta agonist
  • Preferred medicaments are salmeterol, salbutamol, albuterol, fluticasone and any salts, esters or solvates thereof, for instance fluticasone propionate, albuterol sulphate, salmeterol xinafoate and beclomethasone diproprionate.
  • the medicament may also be a glucocorticoid compound, which has anti-inflammatory properties.
  • a glucocorticoid compound has the chemical name : 6 ⁇ , 9 ⁇ -Difluoro-17 ⁇ -(1-oxopropoxy)-11 ⁇ -hydroxy-16 ⁇ -methyl-3-oxo-androsta-1,4-diene-17 ⁇ -carbothioic acid S -fluoromethyl ester (fluticasone propionate).
  • Another suitable glucocorticoid compound has the chemical name: 6 ⁇ , 9 ⁇ -difluoro-17 ⁇ -[(2-furanylcarbonyl)oxy]-11 ⁇ -hydroxy-16 ⁇ -methyl-3-oxo-androsta-1,4-diene-17 ⁇ -carbothioic acid S -fluoromethyl ester.
  • a further suitable glucocorticoid compound has the chemical name: 6 ⁇ ,9 ⁇ -Difluoro-11 ⁇ -hydroxy-16 ⁇ -methyl-17 ⁇ -[(4-methyl-1,3-thiazole-5-carbonyl)oxy]-3-oxo-androsta-1,4-diene-17 ⁇ -carbothioic acid S -fluoromethyl ester.
  • NSAIDs e.g. PDE4 inhibitors, leukotriene antagonists, iNOS inhibitors, tryptase and elastase inhibitors, beta-2 integrin antagonists and adenosine 2a agonists.
  • the medicaments may be livered in combinations.
  • salbutamol e.g. as the free base of the sulphate salt
  • salmeterol e.g. as the xinafoate shalt
  • an anti-inflaminatory steroid such as beclomethasone (e.g. as an ester, preferably dipropionate) or fluticasone (e.g. as an ester, preferably propioante)
  • the actuation indicator of the present invention is not limited for use with an aerosol container, as in the example described with reference the FIGURES of drawings, but may be used with other types of dispensing Device. Moreover, the dispensing device need not be for dispersing medicament.

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EP03740282A 2002-06-21 2003-06-19 Actuation indicator for a dispensing device Expired - Lifetime EP1516283B9 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09153472.7A EP2058754B1 (en) 2002-06-21 2003-06-19 Actuation indicator for a dispensing device
DK09153472.7T DK2058754T3 (da) 2002-06-21 2003-06-19 Aktivitetsindikator til en dispenseringsindretning
CY20091100449T CY1108995T1 (el) 2002-06-21 2009-04-15 Ενδεικτης ενεργοποιησης για μια συσκευη διαθεσης

Applications Claiming Priority (5)

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GB0214360A GB0214360D0 (en) 2002-06-21 2002-06-21 Dispenser with doses counter
GB0214360 2002-06-21
GB0311191A GB0311191D0 (en) 2003-05-15 2003-05-15 Actuation indicator for dispensing device
GB0311191 2003-05-15
PCT/EP2003/006466 WO2004001664A1 (en) 2002-06-21 2003-06-19 Actuation indicator for a dispensing device

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EP1516283B1 EP1516283B1 (en) 2009-02-25
EP1516283B9 true EP1516283B9 (en) 2009-10-07

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EP09153472.7A Expired - Lifetime EP2058754B1 (en) 2002-06-21 2003-06-19 Actuation indicator for a dispensing device

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EP (2) EP1516283B9 (da)
JP (2) JP4568112B2 (da)
CN (2) CN1662930B (da)
AT (1) ATE424010T1 (da)
BR (1) BRPI0311557B8 (da)
CA (1) CA2489554A1 (da)
CY (2) CY1108995T1 (da)
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BR0311557A (pt) 2005-04-26
BRPI0311557B8 (pt) 2021-07-27
HK1075955A1 (en) 2005-12-30
ATE424010T1 (de) 2009-03-15
EP2058754B1 (en) 2013-05-01
CA2489554A1 (en) 2003-12-31
DE60326346D1 (de) 2009-04-09
CN1662930A (zh) 2005-08-31
US7500444B2 (en) 2009-03-10
JP5107976B2 (ja) 2012-12-26
AU2003278236A1 (en) 2004-01-06
EP1516283B1 (en) 2009-02-25
US20090178673A1 (en) 2009-07-16
PT1516283E (pt) 2009-05-11
US20060096594A1 (en) 2006-05-11
WO2004001664A1 (en) 2003-12-31
DK2058754T3 (da) 2013-07-22
EP2058754A1 (en) 2009-05-13
ES2321601T3 (es) 2009-06-09
BRPI0311557B1 (pt) 2020-07-28
CY1114371T1 (el) 2016-08-31
DK1516283T3 (da) 2009-06-15
JP2005530259A (ja) 2005-10-06
PT2058754E (pt) 2013-07-24
MXPA04012753A (es) 2005-08-15
CN101853424B (zh) 2015-05-06
CY1108995T1 (el) 2014-07-02
CN1662930B (zh) 2010-10-27
JP2009273899A (ja) 2009-11-26
HK1127143A1 (en) 2009-09-18
US7832351B2 (en) 2010-11-16
JP4568112B2 (ja) 2010-10-27
EP1516283A1 (en) 2005-03-23
CN101853424A (zh) 2010-10-06
ES2421402T3 (es) 2013-09-02

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